医疗卫生装备2025，Vol.46Issue(5)：14-20,7.DOI:10.19745/j.1003-8868.2025081
基于正弦激励的相控阵超声聚焦控制系统设计
Design of sinusoidal excitation phased array ultrasound focusing system
摘要
Abstract
Objective To design a phased array ultrasonic focusing control system based on sinusoidal signal excitation in order to avoid the introduction of high-frequency interference components into the ultrasonic transducer and improve the electronic focusing performance of phased array ultrasound.Methods The system designed mainly used the high-speed field programmable gate array(FPGA)chip combined with the high-speed digital to analog converter(DAC)to realize synchronous output and control of multi-channel sinusoidal signals.There were 8 sinusoidal excitation emission modules based on FPGA and DAC and one sinusoidal ultrasonic excitation control module based on ZYNQ MPSoC involved in the hardware part of the system,in which the emission modules generated multi-channel sinusoidal excitations and timing control of sinusoidal signals within the module and the control module was responsible for controlling the triggering timing between each sinusoidal excitation transmitter module.The system developed had its software designed with MATLAB App Designer to improve the human-computer interaction experience.Performance verification was carried out for the system by testing the output waveform,inter-channel delay error and focused sound field of each channel.Results The system developed achieved generation and timing control of 64-channel sinusoidal ultrasound excitations,with the output channel main frequency being 0.5 MHz,amplitude within 0 and±12.5 V and the inter-channel delay errors not higher than 26.0 ns;a focused sound field with a focal spot diameter of 4.2 mm(-3 dB)at a depth of 50 mm was obtained when the system was applied to driving a 64-array phased-array transducer.Conclusion The system designed is capable of realizing ultrasonic electron focusing under sinusoidal excitation,which helps to improve the focusing resolution of non-invasive and precise deep brain stimulation techniques relying on the accuracy of ultrasonic focusing such as transcranial magneto-acoustic stimulation(TMAS)and transcranial ultrasonic stimulation(TUS).[Chinese Medical Equipment Journal,2025,46(5):14-20]关键词
超声聚焦控制/相控阵技术/正弦激励/经颅磁声刺激Key words
ultrasonic focusing control/phased array technique/sinusoidal excitation/transcranial magneto-acoustic stimulation分类
基础医学引用本文复制引用
王是愉,刘煦,楚方璇,殷涛,刘志朋,周晓青..基于正弦激励的相控阵超声聚焦控制系统设计[J].医疗卫生装备,2025,46(5):14-20,7.基金项目
国家自然科学基金项目(81927806,52077223,823B2028) （81927806,52077223,823B2028）
国家重点研发计划项目(2022YFC2402202) （2022YFC2402202）
